the things that matter most are eternal

This is how strong and hard this Unbreakable Umbrella is. Use as a walking stick or cane and no one will know you’ve got a weapon in your hand. Weighs less than 2 lb. Carried by the Presidential Security Group (PSG) of the Philippines President.

Frame components are labeled and shipped to building sites as a kit of parts. Because they are assembled with interlocking metal pegs and plates, the frames can be erected by construction teams with minimal training, rather than skilled laborers.ksu.edu

LiTraCon is Light Transmitting Concrete and the 2001 invention of Hungarian architect Áron Losonczi. Optical glass fibres in parallel are mixed into concrete to achieve the special effect. Gizmag
The silhouette of a girl can be seen through the translucent concrete. Here:

Litracon appeals to architects because it is stronger than glass and translucent unlike concrete. wiki